Realme C25s devices started receiving November 2021 Security Patch in the month of December via OTA, it carries an RMX3197.11.A.16 Build number. Although the update fixes bugs and brings stability, this is just an improvement in the security patch without any additional features added.

Similarly, the device had got, October 2021 Security Patch in the month of November, having a similar changelog, like this one.

Realme C25s was released on  June ,2021 with Android 11 Realme UI 2.0

Update Details

• Device: Realme C25s
• Android: Android 11
• Realme UI: Realme UI 2.0
• Build number: RMX3197_11.A.16
• Update type: Software Update / Security Update
• Android Security Patch: November 2021 

Source>> Realme Community

Although it says the update is being rolled out on December 2021, it has the previous month security patch, that's November 2021 Security Patch

Update Changelog

• Security
  • Updated Android Security Patch: November 2021
• System
  • Fixed some known issues
  • Optimized system stability

How long did Realme take for major OS update?

Android OS	Update	Release Date/Status	Estimated Months
Android 11	Out-of-the-box	June 2021	Nil
Android 12	First OS update	Expected	unconfirmed
Android 13	Second/Last OS update	–	–

How long will it get updates?

The Realme C25s came with Android 11 out-of-the-box and it’s anticipated that it will receive an Android 12 update.

Check Out: Realme Android 12 Update list Based on Realme UI 3.0

Hence, the Android 13 update will be the last major OS update on this device.

• Out-of-the-box: Android 11
• First update: Android 12 [eligible]
• Second update: Android 13 [Last update] — No Confirmation

How to install the latest software update on your Realme device?

The Realme C25s came out with Android 11 with out-of-the-box.

Once the update is available on your device, you can head over to Settings >> About Phone >> Software Update section to update your Realme device with the latest security/software update.

How To Check Software Update On Any Realme Smartphone?

• Open Settings.
• Scroll Down and Find Software Update; Tap On It.
• And If There Would any Update available it will appear there.
• Then Hit Download and this is how you can check Software Update on any Realme Smartphone.

Previous updates:

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For more Realme Android updates please download our Android App – Available on the Play Store